Option variable
ibaseDefault value: 10
Integers entered into Maxima are interpreted
with respect to the base ibase.
ibase may be assigned any integer between 2 and 35 (decimal), inclusive.
When ibase is greater than 10, the numerals comprise the decimal numerals 0 through 9
plus capital letters of the alphabet A, B, C, ..., as needed. The numerals for base 35, the largest acceptable base, comprise 0 through 9 and A through Y.